Polyatomic Ions

Cations & Anions

H₃O⁺

hydronium ion

NH₄⁺

ammonium ion

Hg₂²⁺

mercurous ion

O₂^-

superoxide

MnO₄^-

permanganate ion

CN^-

cyanide ion

OCN^-

cyanate ion

SCN^-

thiocyanate ion

NH₂^-

amide ion

I₃^-

triiodide ion

OH^-

hydroxide ion

NO₂^-

nitrite ion

NO₃^-

nitrate ion

HCO₃^-

hydrogen carbonate ion

HSO₃^-

hydrogen sulfite ion

HSO₄^-

hydrogen sulfate ion

HC₂O₄^-

hydrogen oxalate ion

HS^-

hydrogen sulfide ion

HO₂^-

hydrogen peroxide ion

H₂PO₄^-

dihydrogen phosphate ion

CH₃COO^- or C₂H₃O₂^-

acetate ion

OCH₃^-

methoxide ion

ClO^-

hypochlorite ion

BrO^-

hypobromite ion

IO^-

hypoiodite ion

ClO₂^-

chlorite ion

ClO₃^-

chlorate ion

BrO₃^-

bromate ion

IO₃^-

iodate ion

ClO₄^-

perchlorate ion

BrO₄^-

perbromate ion

IO₄^-

periodate ion

O₂^2-

peroxide ion

CO₃^2-

carbonate ion

C₂O₄^2-

oxalate ion

HPO₄^2-

hydrogen phosphate ion

CrO₄^2-

chromate ion

Cr₂O₇^2-

dichromate ion

SO₃^2-

sulfite ion

SO₄^2-

sulfate ion

S₂O₃^2-

thiosulfate ion

PO₄^3-

phosphate ion